The test lead is involved in preparing the test plan. Test engineers are in no way related to preparing test plan role Test engineers are involved in test case design, and execution and bug tracking and reporting them. Generally, test lead is involved in the preparation of the Test Plan. But it is not mandatory only the test lead will take the main part in the preparation of the Test Plan.
The test engineer can suggest to Test Lead if he (or) she has a good understanding of the project and resources if he or she has more experience with the project if the Test Lead is wrongly given deadlines. If your suggestions are valid, Test Lead will incorporate all of them into the Test Plan. But in most of the companies Test engineers are just audience.